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This lecture by the instructor covers the concept of molecular orbitals in conjugated systems, focusing on bond lengths, energy barriers, and electronic interactions in dienes and trienes. It explains the differences between conjugated and cumulated double bonds, the Hückel rule for aromaticity, and the electronic properties of cyclic conjugated systems. The lecture also delves into the quantum states of electrons in polyacetylene, the optoelectronic properties of molecules, and the effects of substituents on electron density. Furthermore, it discusses the application of Hückel theory to linear and cyclic conjugated systems, as well as the graphical representation of energy levels in conjugated systems.